Epson SQ-B50/2550 Technical Manual page 45

REV.-A
1.4.1.4 Self Test Function
The printer has self test functions to check the following items:
• PROM version number
• Panel settings
• Control circuit functions
• Printer mechanism functions and print quality
The settings changed in the SelecType mode are printed in the self test mode. When a self test is
executed using paper from the CSF, the page length is calculated by feeding the paper using 1/6" line
feeds, and 'This is the first line." and "This is D D line." are printed on the first and last lines of the
first page, respectively. In this way, you can confirm the number of printable lines.
When an error occurs, the location of the problem (the host computer or the printer) can be determined
by executing the self test. The self test operation flow is shown below:
Starting the self test in the Draft mode
Turn the printer power on while pressing the
I
LINE FEED
I
switch.
Starting the self test in the LQ mode
Turn the printer power on while pressing the
I
FORM FEED
I
switch.
Stopping or resuming the self test
Press the
I
ON LINE
I
switch. (The ON LINE LED does not light.)
Exiting the self test mode
Stop printing by pressing the
I
ON LINE
I
switch, then turn the printer power off.
WARNING
• To exit the self test mode, be sure to stop printing first as described above. If the stop
operation is omitted, the printhead cannot be capped correctly. This might cause problems
(e.g. the printhead could clog or the carriage may operate abnormally).
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